Coarse Aggregate Testing

Coarse Aggregate Testing

Coarse aggregates are used in all fields of construction to produce bituminous mixtures and concrete to be used in structures, fill materials and as base materials in foundations, roads and railways.

  • Particle Size Distribution
  • Specific Gravity
  • Flakiness
  • Aggregate Impact Value(AIV)
  • Aggregate Crushing Value(ACV)
  • Los Angeles Abrasion
  • Rock Strength

 

PARTICLE SIZE DISTRIBUTION

Analysis of coarse aggregates by particle size provides useful engineering classification system from which a considerable amount of empirical data can be obtained.

Figure 24: Sieve shaker with complete set of sieve

  • 300mm Dia BS Sieves 38, 63, 75, 80, 90, 100, 125, 150, 180, 200, 212, 250, 315, 355, 400, 425, 500, 600, 630, 850 µm Stainless Steel Mesh fitted with Reinforcing Mesh.
  • 300mm Dia BS Sieves 1mm, 1.18mm, 1.25mm, 2mm, 2.36mm, 2.5mm, 2.8mm, 3.35mm, 4mm, 4.75mm  Stainless Steel Mesh
  • 300mm Dia BS Sieves 5mm, 6.3mm, l0mm, 14mm, 20mm, 28mm, 37.5mm, 50mm, 63mm and 75mm Perforated Plate

 

SPECIFIC GRAVITY

Buoyancy balance is used to determine the specific gravity of aggregates

Figure 25: Buoyancy balance

FLAKINESS

Flakiness sieves and gauges are used to determine if aggregate particles are to be considered flaky.

Figure 26: Set of Flakiness sieve

AGGREGATE IMPACT VALUE (AIV)

This test provides a relative measure of the resistance of coarse aggregate to sudden shock or impact

Figure 2

7: Aggregate impact value apparatus

AGGREGATE CRUSHING VALUE (ACV)

This test provides a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load.

Figure 28: Aggregate crushing value

LOS ANGELES ABRASION

The Los Angeles Abrasion machine is used to determine the resistance of coarse Aggregates to fragmentation.

Figure 29: Los Angeles Abrasion Machine

ROCK STRENGTH

The digital point load test apparatus is used to determine the strength of rock samples.

Figure 30:  Digital Point Load Test Apparatus